Use entities in runtime_types

pkg/compiler/lib/src/js_emitter/metadata_collector.dart

Index: pkg/compiler/lib/src/js_emitter/metadata_collector.dart
diff --git a/pkg/compiler/lib/src/js_emitter/metadata_collector.dart b/pkg/compiler/lib/src/js_emitter/metadata_collector.dart
index 7243791c5faaeb71d5f742058977bd8edba60a0a..c4472ff235597dd974d3d9e8af90f9fbbe7f9a6b 100644
--- a/pkg/compiler/lib/src/js_emitter/metadata_collector.dart
+++ b/pkg/compiler/lib/src/js_emitter/metadata_collector.dart
@@ -26,9 +26,9 @@ import '../elements/elements.dart'
         ParameterElement;
 import '../js/js.dart' as jsAst;
 import '../js/js.dart' show js;
-import '../js_backend/backend.dart' show RuntimeTypesEncoder;
 import '../js_backend/constant_handler_javascript.dart';
 import '../js_backend/mirrors_data.dart';
+import '../js_backend/runtime_types.dart' show RuntimeTypesEncoder;
 import '../js_backend/type_variable_handler.dart'
     show TypeVariableCodegenAnalysis;
 import '../options.dart';